A Maryland state trooper and the driver of a car were injured in a crash Sunday morning on Interstate 495 in Prince George’s County, police said.

Trooper 1st Class Robert Cearfoss was parked on the shoulder of I-495 near Route 1 and was monitoring traffic just before 8 a.m. in a marked 2016 Ford Explorer patrol vehicle when a 2016 Dodge Dart left the travel portion of the inner loop of I-495 and struck the back of the patrol vehicle.

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The force of the crash trapped Cearfoss in his vehicle. He was extricated by responding fire and rescue personnel and taken by helicopter to Shock Trauma.

Elwin J. Cedilloz, 23, of Washington, D.C., was driving the car that hit the patrol car, police said. He was taken to Prince George’s Hospital Trauma Center.

MDOT State Highway Administration personnel were called to the scene to investigate. All lanes of I-495 were reopened at about 11:30 a.m.

Troopers are investigating the possibility that alcohol was involved. Charges are pending at this time.